<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="./js/vue-2.4.0.js"></script>
    <style>
        .naiq{

        height: 20px;
        width: 20px;
        background-color: red;
        border-radius: 50%;
    }
    </style>
</head>

<body>
    <div id="app">
        <input type="button" @click="flag =!flag" value="点我">
        <transition v-on:before-enter="beforeEnter" v-on:enter="enter" v-on:after-enter="afterEnter">

            <div class="naiq" v-show="flag"></div>
        </transition>

    </div>
</body>
<script>
    var vm = new Vue({
        el: '#app',
        data: {
            flag: false
        },
        methods:{
            beforeEnter(el,done){
                el.style.transform= 'translate(0,0)'
            },
            enter(el){
                el.offsetHeight
          el.style.transform = 'translate(450px,460px)'
          el.style.translate = 'all 1s ease'
          done()
            },
            afterEnter(){
                 this.flag =! this.flag
            }
        }
    })
</script>

</html>